초록 ▼

A stackable riser having a substantially smooth outer surface has a first open end defined by an edge and a second open end defined by a pair of adjacent channels, so that the edge defining the first open end of a first riser can mate with one of the channels defining the second open end of a second

A stackable riser having a substantially smooth outer surface has a first open end defined by an edge and a second open end defined by a pair of adjacent channels, so that the edge defining the first open end of a first riser can mate with one of the channels defining the second open end of a second riser. A detachable anchor tab extends radially from the outer surface about the circumference of the riser. A plurality of risers can be stacked one on top of another, with, for example, the bottommost riser embedded in concrete and the risers above it embedded in soil. Preferably, the anchor tab of the bottommost riser remains attached to the riser and the anchor tab of the risers above it is removed.

대표청구항 ▼

1. A stackable riser forming a passageway there through, comprising:a continuous side wall having an open first end portion facing in a first direction, an open second end portion facing in a second direction opposite from said first direction, an intermediate portion interconnecting said first and

1. A stackable riser forming a passageway there through, comprising:a continuous side wall having an open first end portion facing in a first direction, an open second end portion facing in a second direction opposite from said first direction, an intermediate portion interconnecting said first and second end portions, and an inner surface and an outer surface; a shoulder on the outer surface of said side wall, said shoulder facing in said first direction and being spaced from said first end portion, wherein said outer surface includes a recess between said shoulder and said first end portion, said shoulder and said recess being shaped to receive the side wall of the second end portion of another riser; a channel on said second end portion, said channel being defined by said side wall and a middle wall member attached to said side wall, said middle wall member being spaced from said inner surface of said side wall, and said channel being shaped to receive a first end portion of another riser; and an anchor tab detachably attached to said outer surface of said side wall, said anchor tab protruding outwardly away from the riser and being adapted for being embedded in surrounding material.